Drilling, milling, or like machine tool



April 22, 1941. F. TURRETTINI 2,239,251

DRILLING, MILLING OR LIKE MACHINE TOOL Filed March 6, 1940 Patented Apr. 22, 1941 iiidi'ih STAT :2

S ftii'ili t i Fernand Turrettini, Bellevue-Geneva, Switzerland, assignor to Societe Genevoise dlnstrumerits de Physique, Geneva, Switzerland, a firm of Switzerland Application March 6, 1940, Serial No. 322,669 In Switzerland July 22, 1939 1 Claim.

The present invention relates to a drilling, milling or like machine tool having a rotatable spindle carrying the tool and being displaceable along its axis, and a slide serving to measure the said displacement and moving in guideways arranged externally on the support of the spindle and paralleliy to the spindle axis, for the same feed length in which the spindle is moved.

It is an object of the invention to provide simple and eflicient means displaceable on the support of the spindle and adapted to cooperate with the above mentioned slide for measuring the axial feed of the rotatable spindle.

Another object of the invention resides in so constructing the mentioned slide as to permit the same to entrain a part of the said means in the direction of its return movement upon withdrawal of the spindle.

With these objects in view, the above specified machine tool provides a carriage displaceable on the support of the spindle, parallelly to the slide, a gauge-block table adjustably secured to the support, said carriage tending to approach said table and carrying a dial indicator adapted to cooperate with said table for measuring the axial spindle feed, and an abutment on the slide permitting the latter to entrain the said carriage only in the direction of withdrawal from the table.

The invention Will be readily understood from the detailed description which follows, reference being had to the accompanying drawing which illustrates, by way of example, one embodiment thereof, and wherein the single figure represents a vertical section along the axis of the tool hold- 1 ing spindle.

In this figure, I is the spindle support, 2 is the sliding quill, and 3 is the tool holding spindle rotating within said quill. The latter is moved by a pinion 5 meshing with a rack 4 formed integral with the body of the quill, and this motion is transmitted by means of a flexible steel strip 1 to a slide l0 movable in guideways ll of the spindle support I. Said strip passes over two idlers 8 and 9 provided with ball bearings, and one of its extremities is attached to the slide l0, While the other extremity is attached to the quill 2.

The slide ill moves in the guideways H for the same feed length as the quill 2, and owing to the arrangement shown of the idlers 8 and 9 in the same direction. Upon withdrawal of the spindle, the slide is drawn upwards by said spindle, and

carried by a setting screw upon the slow advancing motion of the spindle it descends under the influence of its own weight.

In front of the slide II! a carriage i2 is arranged which moves in guideways l3 parallel to those ll of theslide it. This carriage carries a dial indicator Hi, the feeler it? of which cooperates with a small table it adapted to receive the setting parallel gauge blocks. The table it is its engaged in the tappedhole of a slide ll also movable in the guideways I3 and adapted to be locked at any point of said guideways by a clamping screw it.

Finally, the slide it affords an abutment Wt adapted to entrain the carriage l2 upon withdrawal of the spindle. On the other hand, when said spindle advances the carriage l2 bears on said abutment by virtue of its own weight and will be arrested in its downward motion as soon as the feeler l5 resting on the table it or the gauge blocks placed upon said table comes to the end of its range, whereby the slide can continue its downward motion without provoking the slackening of the flexible strip 1, which slackening would be detrimental to the accurate working of the measuring device.

In the embodiment illustrated in the drawing, showing the vertical arrangement of the axis, the downward motion of the movable part is due to the weight of the carriage l2 and the dial indicator l4; should the direction of motion not be vertical, light springs or counter-weights may be provided for displacing the slide l0 and the carriage [2 towards the table It.

I claim:

In a machine tool, a spindle support, an axially slidable quill, a tool holding spindle rotatable within said quill and bodily displaceable therewith, a slide movable along guideways disposed externally on the support and parallelly to the spindle axis, a flexible nonextensible pulling organ connecting the slide with thequill for imparting equal feed from said quill upon said slide, idlers for said pulling organ, assuring equally directed motion of both the quill and slide, a gaugeblock table adjustably secured to the support, a carriage displaceable on the support, parallelly to the slide, and tending to approach said table, a dial indicator carried by said carriage and adapted to cooperate with said table for measuring the axial spindle feed, and an abutment on the slide permitting the latter to entrain the said carriage in the direction of withdrawal from the table.

FERNAND TURRETTINI. 

